Fast case the monomorphic case, by marking the additional checks as deferred
blocks. This increases the code size by about 50 bytes, but the monmorphic
case requires one fewer jump and the all the code is contiguous, so may help
caching.

Also cleanup call and new bytecode handlers by changing some of the Branches
to GotoIf/Unless for better readability.

BUG=v8:4280

Review-Url: https://codereview.chromium.org/2487573005
Cr-Commit-Position: refs/heads/master@{#40910}